Lloyd - just a word of caution on "837" alternators - I had to source one for my Z last year. I really struggled to sort out real from the fakes. It takes a real pro to know is what I found out. Fortunately, Jerry MacNiesh was rebuilding my engine at the time and I was able to get his confirmation the one I was considering was real. I think he rejected 90% of the ones I sent him for consideration (at least 15 - 20 samples). I was quite shocked how many re-stamps are out there.

Heres the one I bought, confirmed by Jerry as a real "837". It's a little early for my build (March), but within the acceptable range. Also, I'll take a better pic if needed.

Lloyd - just a word of caution on "837" alternators - I had to source one for my Z last year. I really struggled to sort out real from the fakes. It takes a real pro to know is what I found out. Fortunately, Jerry MacNiesh was rebuilding my engine at the time and I was able to get his confirmation the one I was considering was real. I think he rejected 90% of the ones I sent him for consideration (at least 15 - 20 samples). I was quite shocked how many re-stamps are out there.

Heres the one I bought, confirmed by Jerry as a real "837". It's a little early for my build (March), but within the acceptable range. Also, I'll take a better pic if needed.

Yes, I agree with your comments Hans. I have seen plenty of 837 stamps and the impressions are most all inconsistant - they were hand/gang stamped for identification and not for artistic merit. On your 837 the bottom of the 0s (zeros) appear irregular and the foot of the first number 1 (one) is mis-stamped, typical irregularities found on others. I have been paying far more attention to the condition of the aluminum case on un-restored orginals as its extremely difficult to fake / replicate 45 years of patina so tampering is easier to detect.

I'm no expert buy that looks pretty damn good to me Edge. Check this link out, it is a RE-STAMP: http://yenkocamaroparts.com/images/Alternator%201100837.jpg

I agree with DT. The stamp looks OK to me and has an original patina to it along with some character imperfections. I'm sure there must have been more than one mechanical stamper in production to keep up with the demand which would account for differences even between close dates. Restamps look too good, IMO.

That re-stamp looks really nice. Like they spent all day getting it just right, and fortunately for us we have guys that can point that stuff out. It seems like really have to look at a large sample before you can start picking out the good form the bad, or correct from re-stamp. There are some talented re-stampers out there thats for sure

Here is my 9-E-23, still has the CZ ink stamp, 100% ORIGINAL for sure, have owned this Z28 since 1974. Its kinda scratched up from some ham fisted morron using a pry bar to tighten the belt, it still has the dated diodes and has never been apart. The 00 is faint on it too, as well as the 7 on the stamp.